Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0e801e8c18b48c…

MALICIOUS

PDF

102.6 KB Created: 2021-07-28 11:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aa091339d9dc892332756f450f78afcb SHA-1: f41f86561f7b545db9f5ee8195554aae991f288b SHA-256: ad0e801e8c18b48c0b13a59dccb53014c3676d2c109ef594d7f0eb71fc037ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm designed to leverage search engine optimization on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://araonline.hu/uploads/file/xalujoxefibimidolexe.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/nuobpr6b81r5em2e4sfd8q2ak5/488771745.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/72050681630.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1b80d542---netezadewub.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/12hs0lbv97212r140622lnvjve/kalakul.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sugbv92ns5js9r1pclatf87rpb/kunukesi.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fexowu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/16590771076.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/jomifutalepitixor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a075edeedf9---72036349342.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mr7lt1u0vrla9p0j8mk8ci94hv/daxekenibovowi.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/80432126880.pdfIn PDF document text
    • http://centronegozi.com/public/84583494273.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/84868913454.pdfIn PDF document text
    • http://capri.lt/userfiles/files/91312462147.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/97020384395.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/gidogeva.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbf58d948---47897058917.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/24082282044.pdfIn PDF document text
    • http://fabtur.ru/upload/files/96731567867.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2jt96u90qeit8ugo4rv89heeas/zirirurufo.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/kugesadu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9270d04b2e---35937942002.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/vuzewukitoxib.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/resuxujefuwog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+movie+google+drivePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 20372 bytes
SHA-256: 3e5eca8af97695f020ea92c711009dbf54a16d3b5a899ce7b16ad1569f0a275b
font_02_sfnt_off00015a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A02 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off00016ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFC 11052 bytes
SHA-256: dd52454c9ef145de8000fc67ab501f4059e08aa0f2eae65a23c029b1a302c25f

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